Stripped my 77 to fit one preload washer but after putting back together to cock the gun i have to pull the lever very hard for it to engage.
Looks like the latch is going far enough back.

Ive shimmed the front stock screws to rule out the cocking arm catching the screws.

Edit - looks like the preload washer is slightly larger then the OD of the spring could the piston be catching the preload washer?